why or how do tidal waves occur ?

Question

hi every body can some one tell me how or why tidal waves occur and if you could tell me 1 of t´hem that would be g8 but both q would be g8er this is for my school assiment and i need the info or if you dont know ot if you know a webb site that i could check can you plz send it 2 me tanx wish me luck and tell me if you lyk my name cheeky girl lol;)

Answer 1

Yes cheeky girl I like your name................

The tsunami is sometimes called a tidal wave that is incorrect. The tidal wave can be caused by the tsunami . It has 'NOTHING' to do with the rivers except if the river enters into the ocean and a tsunami is present then the water in the river can back up and go in the opposite direction.
Tsunamis are cause by underwater disturbances like earthquakes.
Tidal waves are caused by the tsunami which produces HUGE CREST Waves, or huge landslides. Example : when a huge iceberg breaks up it can cause tidal waves.
I have included several links for you to help you pick the one's you understand best.
......................Tidal Wave...............................
http://education.yahoo.com/reference/encyclopedia/entry?id=47182
term properly applied to the crest of a tide as it moves around the earth. In popular usage it is often applied to any destructive wave or to high water not related to tidal phenomena. These latter waves are of two types: tsunami, which are waves caused by earthquakes, and storm surges. Storm surges are floods of ocean or lake water that occur chiefly in areas subject to tropical storms and bordering on shallow waters. In Galveston, Tex., in 1900 a wind velocity of more than 100 mi (160 km) per hr, combined with low barometric pressure, caused tides 15 ft (5 m) above normal that flooded coastal areas, resulting in the loss of thousands of lives and extensive property damage.
.....................What Cause Tsunamis?
http://www.nws.noaa.gov/om/brochures/tsunami2.htm
Tsunamis, also called seismic sea waves or, incorrectly, tidal waves, generally are caused by earthquakes, less commonly by submarine landslides, infrequently by submarine volcanic eruptions and very rarely by a large meteorite impact in the ocean. Submarine volcanic eruptions have the potential to produce truly awesome tsunami waves. The Great Krakatau Volcanic Eruption of 1883 generated giant waves reaching heights of 125 feet above sea-level, killing thousands of people and wiping out numerous coastal villages.

The 1992 Nicaragua tsunami may have been the result of a "slow" earthquake comprised of very long-period movement occurring beneath the sea floor. This earthquake generated a devastating tsunami with localized damage to coastal communities in Nicaragua.
Tidal waves, or tsunami, as scientists call them, are very often the result of earthquakes on the bottom of the ocean. The sea bed shifts and slides like an earthquake on land, causing a great shock wave. Ships that are in the area of the quake fell this shock wave as if they had just struck a rock. Sometimes the shock causes a great depression in the water, and sometimes an enormous mound of water is builds up and travels with great speed across the ocean. Volcanoes can also cause tidal waves. In 1883 the island of Krakatoa in the Dutch East Indies was almost destroyed by a huge volcanic eruption. Great tidal waves were caused by the shock that this explosion started, and the waves made themselves felt on the coasts of Australia and California thousands of miles away.

...............What causes tidal waves?
http://www.4to40.com/qa/print.asp?id=1233
Tidal waves, or tsunami, as scientists call them, are very often the result of earthquakes on the bottom of the ocean. The sea bed shifts and slides like an earthquake on land, causing a great shock wave. Ships that are in the area of the quake fell this shock wave as if they had just struck a rock. Sometimes the shock causes a great depression in the water, and sometimes an enormous mound of water is builds up and travels with great speed across the ocean. Volcanoes can also cause tidal waves. In 1883 the island of Krakatoa in the Dutch East Indies was almost destroyed by a huge volcanic eruption. Great tidal waves were caused by the shock that this explosion started, and the waves made themselves felt on the coasts of Australia and California thousands of miles away.
..........Easier understanding.................
................. for Students...............
....................Tsunamis
for students grade 8

http://www.enviroliteracy.org/article.php/255.html
Planet Pals
Your age group
http://www.planetpals.com/weather.html

Answer 2

A tidal wave or a tsunami, they are different.
A tidal wave is a surge of water caused by a sudden change in the direction of the regular tide, Tidal waves are mostly seen traveling up rivers at great speed.

A tsunami is a surge of water that rushes accross the ocean surface, this is caused by an undersea disturbance, IE:- an earthquake that causes water to be displaced in the ocean.
The best way to demonstrate a tsunami is to drop a pebble into a tub of water, the ripples ar miniture tsunami's.

The latest tsunami event was the Boxing day disaster that hit indonisia a couple of years ago.

Google tsunami to see what you can find.

Answer 3

In this lesson students dispel the misconception that tidal waves and tsunamis are one and the same. Students compare and contrast the two types of waves then research examples of tidal bores to understand how people may perceive them as being the same thing.
Tsunamis and tidal waves are both long ocean waves. Tidal waves, or tides, are a predictable, common occurrence along coastal communities, generated by forces beyond Earth—the gravitational pull of the sun and moon. However, tsunamis are not predictable. They are often generated by earthquakes, volcanic activity, and slope failure.
The appearance of both types of waves can be similar. Most often, tsunamis and tidal waves appear as a surge. Rarely do they appear as an enormous breaking wave. The shape of the ocean floor greatly influences the run-up of a wave as it approaches shore. Bays, inlets, and the mouths of rivers can act as funnels, focusing the energy of the wave into a smaller area, increasing the amplitude ofthe wave. For tidal waves, this may become quite dramatic as the wave may develop a single wave front called a bore. For tsunamis occurring in bays, the results can be devastating. The greatest wave amplitude for a tsunami was recorded in Lituya Bay in 1958, when people witnessed a tsunami reach 524 meters (1,720 feet) high. The highest tides have been recorded in the Bay of Fundy in New Brunswick, Canada. The waves reach 16 meters (52 feet) at the head of the bay.
Tsunamis and tides have some similarities and differences in their characteristics. The period of a wave refers to the time it takes for one wavelength (from crest to crest) to pass a given point. The period of a tsunami wave ranges from 5 to 60 minutes. For a tidal wave, the period ranges from 12 to 24 hours. Both have very large wavelengths, but a tsunami’s wavelength is smaller than a tide’s. Tsunami wavelengths range from 20 kilometers to over 300 kilometers. The wavelength of the tide is thousands of kilometers long. Within the water column, both are similar in that their depth of influence reaches the bottom of the ocean. Because they are so long, the small amplitude of both types of waves would be difficult to notice from a boat out on the open ocean. Tides can be dramatic in different places around the world. The mouths of rivers enhance the tide. In some areas, the change of water level can be more dramatic than in others. Very few rivers have an obvious tidal bore. A tidal bore happens as the leading edge of a tide travels up a river or narrow bay. The following list includes locations where significant tidal bores occur.
• Turnagin Arm of Cook Inlet, Alaska
• Petitcodiac River, Bay of Fundy, New Brunswick, Canada
• Shubenacadie River, Bay of Fundy, New Brunswick, Canada
• The Pororoca, mouth of Amazon River
• The Macareo, Orinoco Delta
• Seine Mascaret, France
• Gironde Mascaret, France
• Trent Aegir, United Kingdom
• Severn River, United Kingdom
• Qiantang River, China
• Lupar Benak, Sarawak, Malaysia
• Hugli (Hooghly), India

Answer 4

either underwater or underground seismic activity such as earthquakes and volcanoes or large landslides